cat save HTTP 500 error

cart save HTTP 500 error

cart save extension: when i active "send email notification" in frontend and backend http 500 error happen.
joomla 3.6
joomshopping 4.7
cart save 1.6.1 (last version i can download when i purchased this addon)

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Aw: cat save HTTP 500 error

1. My orders / order xxx / details
download

2. https://www.webdesigner-profi.de/joomla-webdesign/joomla-shop/forum/posts/7/9639.html?lang=en

Aw: cat save HTTP 500 error

i did comment number 1 and 2.
error 500 in front-end fixed but i'm not sure sending email works because when i check test email this error happen:
Warning: Creating default object from empty value in /home/my server/domains/mysite.com/public_html/components/com_jshopping/addons/addon_jshopping_save_cart/JshSCHelper.php on line 108 Fatal error: Call to undefined method stdClass::setDisplayFreeAttributes() in /home/myserver/domains/mysite.com/public_html/components/com_jshopping/addons/addon_jshopping_save_cart/JshSCHelper.php on line 109

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Aw: cat save HTTP 500 error

front end has not fixed. error:
Warning: include_once(JPATH_JOOMSHOPPING/views/addons/view.html.php): failed to open stream: No such file or directory in /home/mysite/domains/mysite.com/public_html/components/com_jshopping/addons/addon_jshopping_save_cart/JshSCHelper.php on line 279 Warning: include_once(): Failed opening 'JPATH_JOOMSHOPPING/views/addons/view.html.php' for inclusion (include_path='.:/usr/local/php-5.6/lib/php') in /home/mysite/domains/mysite.com/public_html/components/com_jshopping/addons/addon_jshopping_save_cart/JshSCHelper.php on line 279 Fatal error: Class 'JshoppingViewAddons' not found in /home/mysite/domains/mysite.com/public_html/components/com_jshopping/addons/addon_jshopping_save_cart/JshSCHelper.php on line 281

Aw: cat save HTTP 500 error

Update joomshopping to new version.

Aw: cat save HTTP 500 error

i updated joomshopping to 4.16.0 and it works.
but when i add a product for first time and add it again for second time, i see two rows with quantity 1 for same products in basket.
in the past, basket show 1 row with two quantity.
problem in cart save addon or joomshopping update?

see attachment in your private.

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Aw: cat save HTTP 500 error

url?
admin login?
privat